Internal-combustion rock-drill.



L. L. SCOTT.

INTERNAL UOMBUSTION ROCK DRILL.

APPLIUATION FILED'MAY 11,1907 91 5,893. Patented Mar. 23, 1909.

LEWIB L. soo'rr, or ,JoPLIN, mssooai.

m mnnan-comsusrroiv BOOK-DRILL.

Qpeciflcatlon 0! Letters Patent.

Patented March as, 1969.

Appllcctiqn filed-lay 11, 1901. Serial No. 878,172.

To all whom it may concern: 1

Be it known that I, Lewis L. Scor'r, a citizen of the United States, residing" at Jo lin, in the county of Jasper and the State of issouri, have invented new. and useful 11np)roveinents in Internal-Combustion R01 krills, of which the following is. a specificatron.

Mydnvention relates to an improvement in gas actuated rock drills, and more; articularly to the method of attachin the rill rod to the source of power;- and't emetho'd of rotating the drill bit.

, the bearing 11 which carries a shaft 5.

The objects of my invention are; let, to provide a gas rock drill that will be strong and able to stand the racket'that it is required to stand; 2nd, to have the fewest numher of parts,- which will therefore simplify the drill; 3rd, to provide a new and novel construction for connectin the drill rod to the ,source of power, and a so a cushionfor relieving the blow of the drill rodagainst. the main body of the drill; 4th, to provide a simple, durable and eflicient means for rotating the rock drill bit of my rock drilling en inc;

I attain these objects by the mechanism i lustrated in the accompanying drawings, in which, i

' Figure 1 represents a to plan view (shown in section), of my rock dri ing engine. Fig. 2 represents a side elevation (shown partly in section) of my improved rock drilling engine. Fig. 3 is a section on the line 33 of Fig. 1.

Similar numerals of reference. refer to-similar p'arts through all drawings. I

In constructing my internal combustion rock drill I provide a specially constructed two cycle gas engine, which has a cylinder 12, closed at both ends. The explosive chamber 37 being in one end of the cylinder 12,

and the chamber 38 (which receives the charge of gas and air), being in the other. The explosive end of the cylinder 12 is closed by the head 36, which also serves to support The fly wheels 1, are keyed to the shaft 5, and are connected to one of the ends of connecting rods 2, b means of the pins 4. The other ends of t e connecting rods 2 are connected to the piston 14 by means of. the pin 3. The cylinder 12 is rovided with an exhaust port 29, and an in ct port 28, also with an inlet port 30, andan exhaust port 27. The .ports 27 and 28 are connected together by any suitable means (such as a hose or a pipe 42),.for a purpose to be more fully described.

The cylinder 12 has the slots 13 cored out pin 3 to move back and forth. 16 is connected at one end to the drill bit 15, (by any suitable chucking device), and at the other end to the piston 14. The drill rod 16 is drilled and tapped at its inner end in reoeive the disk 26.

A'plate 23' is fixed to the piston 14, by means of cap screws 24, and bears against the disk 26, said disk 26 being fixed to drill rod 16. The piston 14 is bored out th receive a rubber disk 25 which fits between the piston and the disk 26; said disk 25 serves the pa ose of cushionin the bl v against the main body of the dril when t! drill bit strikes the rock. The chamber 38 is closed by the cylinder head 18, which also serves as a stuffing box around the reciproeating drill rod 16. A casting 19 fits loosely ,over the drill-'rod 16; one end of said casting struction the casting 19' is free to revolve around the drill rod 16, but cannot move back and forth, on account of the head 18 on one side and the projecting screw on the other; The screw 20 is secured to the cylinder head 18, and carries the pawl 21, which works in the ratchet formed on the casting 19. The drill rod 16 has a spiral groove 39 milled partly around its circumference; the set screw 22, is secured to the casting 19, and

works in the s iral groove .39, for a purpose to be more in y described. The arms 35 and the lug 33 form a part of the casting 12. The cylinder 1 andconnccted parts are (13F ricd by some sniitable supporting frame, such as 34, on whi Lh the are adjustable a screw 6 or by some ot ier equivalent and convenient device, in connection with which the. usual tripod support may be utilized.

The 0 eration'of my internal combustion rock dril is as follows: The mixture of gas and air is drawn in (through any suitable check valve), at the port 30; on the downward stroke of the iston 14 the gas and air is compressed, so tliat when the piston l4,

uncovers the port 28, the mixture of gas and airrush into the chainbcr3' the ports 27 and 28 being connected together by any H111I by means of the rubber cushion25.

agznlly arranggd groove 39. By means of .t

,zhlw pipv'm' hose connection 42 as aforesaid. On the upward stroke of the .piston 14, the I mixture of gas and air in the chamber 37 is i compressed and exploded (the explosion be- 1 ing caused by an electric spark in the charm her 37, commonly used on gas engines), at the some timo a new charge is drawn in the (-lwmbm' 38. By this arrangement we got 1' drf'dxplosion on oa-oh dovynilranl stroke of the 1 iston 14. After the en ine is in motion the ilrill can be fed down to t it: rock by means of 1 the screw 6. On each upward stroke the piston 14 the drill rod 16 is. rotated, a. e., when the drill nod 16 moves upwnrd, the Cast- ,ing 19 (which is fixed in the spiralgroove 39 of the drill rod 16, by moans of the set screw 22), is held firm b the pawl 21, working in the ratchet end 0 the casting l9, and the drill rod 16 is forced to revolve; on the downward stroke of the drill rod 16 the pawl 21 releases the ratchet of the castinghlli and the said casting 19 revolves so that e pow! 21 takes a new hold on the ratchet l9.

ills-blow is relieved from the body of the drill,

The casting 19 forms an extension of the ratchet hub, which extension inoloses tho oxtension an extra long smiling box is nvoidqulriirjhich would be nocesnry to avoid formed on the portion inclosed leakago if the pin '22 was lorated near the ratchet.

Havin thus fully described my invention,

; what I c aim as new, and rlosirrin sm'uro by Letters Patent is,

In a demon of tho kind rloscrlbmi. a :Lylim I I o f der, :1- plston, a drill rod ran-nod bv the p ston and working through on (11d of the r' a ratchot rotatable loosoly Upon snid du'll rod and within the cylinder, a snow var-rim! bythe cylinder head and extending inimlrr wnrdly beyond said ratchet, s pmjection can ried by said scrs'w lmmlyengaging the inner face of the ratchet, a pawl pivoted by said screw and engaging tho ratchet teeth, a cast mg fol-mm an (XILIISIQII of the hub or tho ratchet an extruding inwardly toward tlu piston ond inclosing a portion of the drill rod, said rod having aspirallv arranged groove by said oxtansion and at a distance from the ratchet, and means carried by said extension for engagement with said cove, said means being arranged adjaoent t e inner end of tho said extension and at a distance from the said ratchet, as and for the pn so set forth.

In testimony whereof I lave hrwunl-o so. my hand this 26th day of March, A. l). 190?.

LEWIS L. SCOT'IX Witnesses:

R. H. Hnxros, Mrs. Gno. Donrnnn. 

